Observation is an act of gaining knowledge using our own minds as a tool. It is much more than just looking, it is looking without the fog of conditioning and beliefs, and consciously and carefully arriving at an answer to a question. It is a skill every seeker must have, it is an art that can be learnt via practice and proper guidance. A sharp observation will end the need for books or teachers, you will never need to memorize a single thing, and you will be always 100% sure of what you know. Most importantly, you will be able to destroy your ignorance at a blinding speed.